Vortec Head Modifications : Chevy 4.3L 262ci V-6 - Engine Build - Overview - Tech ... - Two years ago we undertook an exhaustive (no pun intended) study of the vortec head in numerous modified states with different valve sizes, throat cuts, valve jobs, port mods, guide mods, etc.
Vortec Head Modifications : Chevy 4.3L 262ci V-6 - Engine Build - Overview - Tech ... - Two years ago we undertook an exhaustive (no pun intended) study of the vortec head in numerous modified states with different valve sizes, throat cuts, valve jobs, port mods, guide mods, etc.. These heads are good for a minimum 50hp gain. Vortec head modification for.480 lift. Discussion starter · #1 · sep 24. I am not going to install lash caps. The end result is a head that will produce a measurable improvement and.
Tony, just remember that total lift is the cam lobe lift and the rocker arm ratio for total lift. Tbi to vortec head conversion gmc truck forum / vortec heads also use a different intake bolt angle than traditional sbc heads and, as mentioned previously, camshaft lift needs to be kept on the low side, unless other modifications are made. This is the speed secrets episode for you! By changing the springs, the distance between the retainers and the valve seals hasn't changed. Joined sep 19, 2010 · 120 posts.
94 Chevy S10 Super Sport from www.chevymetalhead.net These are complete ready to run heads, they are also available under a different p/n as machined but bare. So you can see, the oem tune really chokes the potential vs carb. Tony, just remember that total lift is the cam lobe lift and the rocker arm ratio for total lift. Just be careful with used vortec heads as they are prone to cracks after 100k+ miles of heat and cooling cycles, iron cracks. Valve spring seat diameter is 1.280. The stock valve job can be improved on vortec heads. Are you looking to get almost 100 more horsepower from your gm 350 crate engine? The vortec 350 came in hundreds of thousands of chevrolet and gmc pickups, suvs, and vans from 1996 to about 1998, so they are easy to find and relatively inexpensive to build.
As illustrated in the pics in post #60;
My cams gross lift is.559. Even with the valves removed, it resembles a stock head. Valve spring seat diameter is 1.280. The worst piece on the whole tpi system is the cold start injector or referred to as the 9th injector. The cam is based on the maximum lift for stock vortec heads and is a single pattern 215d/470l on a 112 center. Modifying the heads to accept early intake manifolds is not recommended. Vortec head modification for.480 lift. By changing the springs, the distance between the retainers and the valve seals hasn't changed. As illustrated in the pics in post #60; Tbi to vortec head conversion gmc truck forum / vortec heads also use a different intake bolt angle than traditional sbc heads and, as mentioned previously, camshaft lift needs to be kept on the low side, unless other modifications are made. Featuring the comp cams xm270h ca. Two years ago we undertook an exhaustive (no pun intended) study of the vortec head in numerous modified states with different valve sizes, throat cuts, valve jobs, port mods, guide mods, etc. The real weakness of the vortec head is the exhaust port, a fact that is readily apparent when you get into porting these heads.
The stock valve job can be improved on vortec heads. Two years ago we undertook an exhaustive (no pun intended) study of the vortec head in numerous modified states with different valve sizes, throat cuts, valve jobs, port mods, guide mods, etc. Are you looking to get almost 100 more horsepower from your gm 350 crate engine? As illustrated in the pics in post #60; This quick tech video from comp cams® demonstrates how easy it is to use valve spring seat cutters and valve guide cutters to quickly and easily machine near.
Raylar 202 cam in 8.1 - PerformanceTrucks.net Forums from www.raylarengineering.com They also feature gm logo cast into bottom of intake ports. Comp cams recommends that its pn. + up to.550 lift on vortec heads w/ no mods! For stock cam, heads and cr that's very good. These are complete ready to run heads, they are also available under a different p/n as machined but bare. As illustrated in the pics in post #60; 1 of 2 go to page. Starting in 1996, on several gm trucks and vans, the l31 vortec heads came on the scene.
There are other, smaller points that are important to know because they affect cam selection.
We used up about 10 heads, numerous valves, and about $50,000 worth of labor. Featuring the comp cams xm270h ca. My vortec heads are good to.500 in/.530 ex (with 'forgiveness' in mind) with common components used and absolutely no machining done to the heads valve guides/spring pockets. I ported mine and fully worked the exhaust port (bowl work and contouring the runner). The l76 is a gen. Tbi to vortec head conversion gmc truck forum / vortec heads also use a different intake bolt angle than traditional sbc heads and, as mentioned previously, camshaft lift needs to be kept on the low side, unless other modifications are made. My cams gross lift is.559. The study generated 100+ pages of flow and swirl data, which i have at my. Even with the valves removed, it resembles a stock head. So the best bang for the buck is gm vortec head but does require a special intake and lots of egr work if you need egr to remain emission legal. So you can see, the oem tune really chokes the potential vs carb. Increased valve lifts require stronger springs. This upgrade guide is for the 6.0l l76 vortec max truck engine, specifically.
By changing the springs, the distance between the retainers and the valve seals hasn't changed. Valve spring seat diameter is 1.280. These heads are good for a minimum 50hp gain. My vortec heads are good to.500 in/.530 ex (with 'forgiveness' in mind) with common components used and absolutely no machining done to the heads valve guides/spring pockets. I ported mine and fully worked the exhaust port (bowl work and contouring the runner).
Street-Style Vortec Head Test - Tech Article - Chevy High ... from image.superchevy.com Tbi to vortec head conversion gmc truck forum / vortec heads also use a different intake bolt angle than traditional sbc heads and, as mentioned previously, camshaft lift needs to be kept on the low side, unless other modifications are made. Can be machined for 2.020/1.600 valves. Even with the valves removed, it resembles a stock head. My vortec heads are good to.500 in/.530 ex (with 'forgiveness' in mind) with common components used and absolutely no machining done to the heads valve guides/spring pockets. Vortec head modifications hi everyone, im looking to modify a set of vortec heads for oval track racing application. As illustrated in the pics in post #60; So you can see, the oem tune really chokes the potential vs carb. They also feature gm logo cast into bottom of intake ports.
+ up to.550 lift on vortec heads w/ no mods!
We used up about 10 heads, numerous valves, and about $50,000 worth of labor. These are iron vortec style heads with heavier casting thicknesses and 2.02 and 1.55 inch valves, they accept higher lifts without modification and feature a 180 cc intake for the 421 and 206 cc intake for the 431. Gm also sells vortec pattern intakes for tbi and 4bbl's. They also feature gm logo cast into bottom of intake ports. Increased valve lifts require stronger springs. The stock valve job can be improved on vortec heads. + up to.550 lift on vortec heads w/ no mods! Tony, just remember that total lift is the cam lobe lift and the rocker arm ratio for total lift. For stock cam, heads and cr that's very good. So the best bang for the buck is gm vortec head but does require a special intake and lots of egr work if you need egr to remain emission legal. Iv engine based off the ls2, which was also produced both as a car engine and a truck engine. I am not going to install lash caps. Vortec heads require a dedicated intake as they only use 4 bolts per side, and the bolt angles are quite a bit different.
